2015 Subaru WRX STI Launch EditionFACTORY OEM SERVICE PROCEDURE

Intake Manifold: Removal

  1. Remove the V-belt covers.
    Fig 1: Locating V-Belt Cover
    G06344549Courtesy of SUBARU OF AMERICA, INC.
  2. Collect the refrigerant from A/C system. <Ref. to PROCEDURE , Refrigerant Recovery Procedure.>
  3. Release the fuel pressure. <Ref. to RELEASING OF FUEL PRESSURE , PROCEDURE, Fuel.>
  4. Disconnect the ground cable from battery.
  5. Open the fuel filler lid and remove the fuel filler cap.
    NOTE: This operation is required to release the inner pressure of the fuel tank.
  6. Lift up the vehicle.
  7. Remove the under cover. <Ref. to REMOVAL , Front Under Cover.>
  8. Drain approximately 3.0 L (3.2 US qt, 2.6 Imp qt) of coolant. <Ref. to DRAINING OF ENGINE COOLANT , REPLACEMENT, Engine Coolant.>
  9. Remove the air intake duct. <Ref. to REMOVAL , Air Intake Duct.>
  10. Remove the chamber assembly. <Ref. to REMOVAL , Chamber Assembly.>
  11. Remove the intercooler. <Ref. to REMOVAL , Intercooler.>
  12. Remove the air intake boot.
    Fig 2: Locating Air Intake Boot
    G10264703Courtesy of SUBARU OF AMERICA, INC.
  13. Remove the air by-pass valve. <Ref. to REMOVAL , Air By-pass Valve.>
  14. Remove the generator. <Ref. to REMOVAL , Generator.>
  15. Remove the coolant filler tank. <Ref. to REMOVAL , Coolant Filler Tank.>
  16. Disconnect the A/C pressure hoses from A/C compressor. <Ref. to REMOVAL , Hose and Pipe.>
  17. Disconnect the engine coolant hose from throttle body.
    Fig 3: Locating Throttle Body Engine Coolant Hose
    G08538634Courtesy of SUBARU OF AMERICA, INC.
  18. Disconnect the brake booster vacuum hose (A) and pressure regulator vacuum hose (B) from the intake manifold.
    Fig 4: Identifying Intake Manifold Brake Booster And Pressure Regulator Vacuum Hoses
    G08538635Courtesy of SUBARU OF AMERICA, INC.
  19. Disconnect the connector from the PCV hose assembly A.
    Fig 5: Locating PCV Hose Assembly A Connector
    G10264706Courtesy of SUBARU OF AMERICA, INC.
  20. Remove the PCV hose assembly A from clip (A), and remove the vacuum hose from clip (B).
    Fig 6: Identifying PCV Hose Assembly A And Vacuum Hose Clips
    G10264707Courtesy of SUBARU OF AMERICA, INC.
  21. Disconnect the vacuum hose (A) and the connector (B) from the PCV hose assembly B.
    Fig 7: Identifying PCV Hose Assembly B Connector
    G10264708Courtesy of SUBARU OF AMERICA, INC.
  22. Disconnect the air control hose (A) from the waste gate actuator, and loosen the clamp which holds the intake duct to the turbocharger.
    Fig 8: Locating Turbocharger Intake Duct Clamp
    G06344555Courtesy of SUBARU OF AMERICA, INC.
  23. Remove the engine coolant hose from the water tank pipe.
    Fig 9: Locating Water Tank Pipe Engine Coolant Hose
    G08538640Courtesy of SUBARU OF AMERICA, INC.
  24. Remove the engine harness from clip (A).
    Fig 10: Identifying Engine Harness Clip
    G08538641Courtesy of SUBARU OF AMERICA, INC.
  25. Disconnect the bulkhead harness connectors from the engine harness connectors.
  26. Lift the claw (A) and remove the engine harness connector from the engine harness bracket.
    Fig 11: Locating Engine Harness Bracket Connector
    G10264712Courtesy of SUBARU OF AMERICA, INC.
  27. Disconnect the connector (A) from the engine coolant temperature sensor, connector (B) from the oil pressure switch, and connector (C) from the crankshaft position sensor.
    Fig 12: Identifying Engine Coolant Temperature Sensor And Crankshaft Position Sensor Connectors
    G08538644Courtesy of SUBARU OF AMERICA, INC.
  28. Disconnect the connector from power steering pump switch.
    Fig 13: Locating Power Steering Pump Switch
    G08538645Courtesy of SUBARU OF AMERICA, INC.
  29. Disconnect the connector from the knock sensor.
    Fig 14: Locating Knock Sensor
    G06344560Courtesy of SUBARU OF AMERICA, INC.
  30. Disconnect the connector from the secondary air combination valve.
    Fig 15: Locating Secondary Air Combination Valve
    G06344561Courtesy of SUBARU OF AMERICA, INC.
  31. Disconnect the connector from the intake camshaft position sensor.
    Fig 16: Locating Intake Camshaft Position Sensor
    G06344562Courtesy of SUBARU OF AMERICA, INC.
  32. Disconnect the connector from the intake oil flow control solenoid valve.
    Fig 17: Locating Intake Oil Flow Control Solenoid Valve
    G06344563Courtesy of SUBARU OF AMERICA, INC.
  33. Lift up the vehicle.
  34. Remove the engine harness cover. (right side only.)
    Fig 18: Removing Engine Harness Cover
    G06344564Courtesy of SUBARU OF AMERICA, INC.
  35. Remove the clip holding the engine harness. (Left side only)
    Fig 19: Locating Engine Harness Clip
    G10264720Courtesy of SUBARU OF AMERICA, INC.
  36. Disconnect connector (A) from the exhaust camshaft position sensor, connector (B) from the exhaust oil flow control solenoid valve, and connector (C) from the ignition coil.
    Fig 20: Identifying Exhaust Camshaft Position Sensor And Oil Flow Control Solenoid Valve Connectors
    G08538651Courtesy of SUBARU OF AMERICA, INC.
  37. Lower the vehicle.
  38. Remove the clip (A) which hold the engine harness to the rocker cover RH.
    Fig 21: Identifying Rocker Cover RH Engine Harness Clip
    G06344566Courtesy of SUBARU OF AMERICA, INC.
  39. Remove the bolts that secure the air duct to the rocker cover LH, and remove the engine harness.
    Fig 22: Locating Rocker Cover LH Air Duct Bolts
    G08538653Courtesy of SUBARU OF AMERICA, INC.
  40. Disconnect the fuel delivery hose, fuel return hose and evaporation hose.
    CAUTION:
    • Be careful not to spill fuel.
    • Catch the fuel from hoses using a container or cloth.
    1. Set the ST to the fuel pipe.

      ST 42099AE000 QUICK CONNECTOR RELEASE

    2. Disconnect the quick connector of the fuel delivery hose and fuel return hose by pushing the ST in the direction of the arrow.
    3. Remove the clip and disconnect the evaporation hose from the fuel pipe.
    Fig 23: Setting Quick Connector Release (42099AE000) To Fuel Pipe
    G10264724Courtesy of SUBARU OF AMERICA, INC.
  41. Remove the intake manifold from cylinder head.
Fig 24: Locating Cylinder Head Intake Manifold Bolts
G08538655Courtesy of SUBARU OF AMERICA, INC.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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